In recent decades, atmospheric concentrations of carbon dioxide and other greenhouse gases have risen dramatically (Keeling and Whorf, 2005). The consequent effects on global and regional climates are uncertain (Barnett et al., 2006; Hennessy et al., 2006; Karl and Trenberth, 2003; Wentz et al., 2007) and remain controversial (Hegerl et al., 2007; Lovell, 2006; Schneider, 2001; Schneider, 2007), but the potential impacts of changes in the mean and variance of climate variables on hydrology must be anticipated with careful investigations. Although significant progress has been made toward assessments...

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